INSERT INTO sql code connection issues - sql

Question

I have successfully managed to use SELECT and DELETE SQL statements and now I am trying to use INSERT INTO. However I keep getting this error:
ExecuteNonQuery requires an open and available Connection. The
connection's current state is closed.
So I tried putting con.Open() to see if that would help and I got this error:
The ConnectionString property has not been initialized.
I was wondering if anyone knows what I have done wrong. Or just if anyone has any working code. Preferably I would like to not use parameters if that is possible because I don't understand them at all. Here is my SQL code:
Dim con As OleDb.OleDbConnection
Dim comm As OleDb.OleDbCommand
con = SQLConnect()
comm = New OleDb.OleDbCommand()
comm.CommandText = "INSERT INTO " & TableName & " (" & Column & ") VALUES (" & Value & ")"
comm.Connection = con
comm.ExecuteNonQuery()
con.Close()
Here is the connection code:
Public Function SQLConnect() As OleDb.OleDbConnection
If Connector.State = ConnectionState.Open Then
dbprovider = "PROVIDER=Microsoft.ACE.OLEDB.12.0;"
dbsource = "Data Source = NEA.accdb"
Connector.ConnectionString = dbprovider & dbsource
Connector.Open()
End If
Return Connector
End Function

Answer 1

Use one open connection and one close connection like this:
Open the connection
Execute all your DELETE and INSERT queries.
Close the connection.
Try this:
con.Open()
comm.Connection = con
comm.CommandText = "DELETE ..."
comm.ExecuteNonQuery()
comm.CommandText = "INSERT INTO " & TableName & " (" & Column & ") VALUES (" & Value & ")"
comm.ExecuteNonQuery()
con.Close()
BTW, I recommend that you use parameters instead of string concatenation on your sql query. To avoid sql injection.